Part No. 1268494 S-100 • S-105 • S-120 • S-125 3 - 71March 2017 Section 3 • Repair Procedures9-1Function PumpsThere are three hydraulic pumps connected tothe engine. There is one variable displacementpump that is used for drive functions and two fixeddisplacement pumps attached to the drive pumpthat are used for all other machine functions.How to Remove theFunction PumpsNote: When removing a hose assembly or fitting,the O-ring on the fitting and/or hose end must bereplaced and then torqued to specification duringinstallation. Refer to Specifications, HydraulicHose and Fitting Torque Specifications.1 Close the two hydraulic tank valves located atthe hydraulic tank.Component damage hazard. Theengine must not be started withthe hydraulic tank shutoff valves inthe closed position or componentdamage will occur.If the tank valves are closed,remove the key from the keyswitch and tag the machine toinform personnel of the condition.2 Tag, disconnect and plug the hydraulic hosesfrom the function pumps. Cap the fittings on thepumps.Bodily injury hazard. Sprayinghydraulic oil can penetrate andburn skin. Loosen hydraulicconnections very slowly to allowthe oil pressure to dissipategradually. Do not allow oil tosquirt or spray.3 Support the function pumps with an overheadcrane or other suitable lifing device.4 Remove the pump mounting bolts. Carefullyremove the pumps.Crushing hazard. The functionpumps may become unbalancedand fall when the mountingbolts are removed if they are notproperly supported.Component damage hazard.Be sure to open the two hydraulictank valves and prime the pumpsafter installing the pumps.See 9-2, How to Prime the Pumps.open closedHydraulic Pumps
